* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  body {
    min-width: 320px;
    max-width: 750px;
    width: 10rem;
    margin: 0 auto;
    line-height: 1.5;
    font-size: 14px;
    font-family: Arial, Helvetica;
    background: #F2F2F2;
  }
  /*点击高亮我们需要清除清除  设置为transparent 完成透明*/
  a {
    -webkit-tap-highlight-color: transparent;
  }
  /*在移动端浏览器默认的外观在iOS上加上这个属性才能给按钮和输入框自定义样式*/
  input,
  button {
    -webkit-appearance: none;
    outline: 0;
    border: 0;
  }
  /*禁用长按页面时的弹出菜单*/
  img,
  a {
    -webkit-touch-callout: none;
  }
  li {
    list-style: none;
  }
  img {
    vertical-align: middle;
  }
  a {
    color: #666;
    text-decoration: none;
  }
  .clearfix::after {
    content: "";
    display: block;
    height: 0;
    visibility: hidden;
    clear: both;
  }
  